package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务器调用地址
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信服务接口，获得当前微信用户的openid

        Map<String,String> map=new HashMap<>();
        //传入Id，密钥等
        //appid  string
        //secret string
        //js_code 登录时获取的code
        //grant_type   授权类型，只需要填写authorization_code
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",userLoginDTO.getCode());
        map.put("grant_type","authorization_code");

        //向微信服务端传输值  注意是json格式
        String json=HttpClientUtil.doGet(WX_LOGIN,map);
        //将json字符串转化成真正的json,以获取传过来的openid（用户唯一标识）
        JSONObject jsonObject= JSON.parseObject(json);
        //通过返回的关键字获取openid
        String openid=jsonObject.getString("openid");

        //判断openid是否为空，若为空，说明传过来的userLoginDTO有问题，登录失败，抛出业务异常

        if(openid==null){

            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户

        User user=userMapper.getByOpenid(openid);

        //如果是，自动完成注册

        if(user==null){
           user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
           userMapper.insert(user);
        }
        //返回用户对象
        return user;
    }


}
